I learned the Jackknife before the Swipeknife, but Jackknife feels a lot harder for me personally. The horizontal position of the Swipeknife, gives me more room for my legs in the air. It’s totally doable to learn the Swipeknife first if you are more comfortable with Raiz and Sideswipe-like tricks, but it will help tremendously if you are already able to throw a decent Jackknife. You want your Jackknife to have a Roundkick that is kicked over fast. So kind of like a fast 540 Kick with an additional hook, rather than a Cheat 720 with a snapping Roundkick. Also you need to be able to throw the hook before or while you land - not after.